Summary of Abstract Submission

Abstract Submission No. IO50-07-0053PresentationOral

CONNECTION OF SEA LEVEL VARIABILITY BETWEEN THE WEST TROPICAL PACIFIC AND THE SOUTH INDIAN OCEAN DURING RECENT TWO DECADES

Yan DU*1, Tianyu WANG1

1 LTO, SCSIO, Chinese Academy of Sciences, China

ABSTRACT :

Using merged satellite altimeter data and in-situ observations, as well as a diagnosis of linear baroclinic Rossby wave solutions, this study analyzed the rapidly rise of sea level/sea surface height (SSH) in the tropical Pacific and Indian Oceans during recent two decades. Results show that the coherent sea level rises in the tropical west Pacific and the southeast Indian Ocean are closely linked to each other through the pathways of oceanic waveguide within the Indonesian Seas. The dynamic adjustments mainly occur in the thermocline.The low-frequency wave signals generated in the tropical Pacific propagate westward and influence the southeast Indian Ocean through the Indonesian Seas,while the impacts of the local wind forcing are more important to the sea level rise in the southwest IO. Analyses of the lead-lag correlation further reveal the different origins of interannual and interdecadal variations in the tropical Pacific. The interannual wave signals is dominated by the wind variability along the equatorial Pacific, which is associated with the El Niņo-Southern Oscillation; while the interdecadal signals are mainly driven by the wind curl off the equatorial Pacific, which is closely related to the Pacific Decadal Oscillation.